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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9255dff3f6618444ce339af1473fb041b0874c56320a5015019cbcacae52e9' 
  AND token = 'owQ7DoKD+xrPkit9yZ7dTqZe06Y7yg9lQS3J/KSiV64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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