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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6588623f74d6ea5498c2035d14871b25d8ab7dc9bb72f5b47bcdb56429cc9168' 
  AND token = '8ZfyelaBrUeeBWeavP018zlfKmxbzj7ZA0wC7NeQ+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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