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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf6062d41a4d55b265cba67da392af74470a8f3440e33a0a82cec8958311a92' 
  AND token = 'hR6A8NKjehAI5JVQf3J6yjDpvnJgtozXy2ygXuShfkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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