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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90e68cd1666fcd3d273b4daa41679cf96cbf5b04a9cca1693f5232719481973' 
  AND token = 'XNVQ7RNxq2qgHaaeHGAHY8dKKe9elBziMzTTcKDOBPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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