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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca12f9766211b43d7eaf9cbf8debf4f5ee05c6bf7ea8948838373db34f7fd9c' 
  AND token = 'boO6RLjnXaM0spZ4it4Qn0IiQU1CVciy32kFpqCmmig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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