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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfa99aea3ae35e0c21d51f6885548b0aa65b1290ebe2eec2d8f29a1c273cf11' 
  AND token = 'fk9FbeTdqY7KuNATzHNCZTm+iEXDF6xjVCeq284F4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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