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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f513192ec4fc80efbdf4e9e23479d4e42c538a911e34bdf0e2d93b08d71320bd' 
  AND token = '23KOd8YJL3aApZxhQTfIIId1FpfX4C2SMFPBRLPZsPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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