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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83552f3087365e9983a7ccd95bff8b328ce639b2cb569f95a44029052b90942e' 
  AND token = 'AF9LgjGfEfdRdoHBdFfcoYkZdpeiC9zojkU/pk+2ytI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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