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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1795b2c45215419dac0d62deda7857ee8f828f1ded296f85a39279c0ab885a' 
  AND token = 'O6MPMUlMC2sENkMZ0v3+7M3T85+F/fkB6/+5k8tPzEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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