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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedb6eb1b8be64c7b66bc793851554cc161cc22f1c887b6745aafde7a11e43d8' 
  AND token = 'jGj3Upm2nmKT8I8LJUbxJDYG2TW+GrS+8uAMps/8RJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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