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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3f65ec518c89c254da89648e20781e1284caf265fa3477ef0cd58d32e39dc' 
  AND token = '9ieNvGe1NBfcYrkVCTNkVteiT2favUkn2zbAuyA21/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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