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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e034dc23f5528e0d8e77c84a279979ab7b3626f5cf287592beeb3ef09a56625' 
  AND token = 'u0ViaP68x12zAjOp0rh2VH7iVP3MjFHm3LX14N9T7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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