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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca4688bc25b2357e282f8f813f65580fe8e949557816ba5c1c23bebb147664e' 
  AND token = 'OUbnyF1FLaUVLKU9kzDT1WIfY6Xs/5CI8xpk/E8QJj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}