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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f354560914114d6abd038bd99edffab50fe9c4a17cd8f1943871ab39bb9c1b9e' 
  AND token = '3Jhk2bKC8OiLIbequHIDjC6qRnAJDYgXIuJv4wMoO8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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