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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5fecb3a397b1bd096e9b127d284f609c33dcde6072845ee3bf94f38c598b7e' 
  AND token = '7bkNT4m1vKSy0CiTbq1/uUu5YrjkYrHPJ0V19DYw288=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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