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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042fbd0f7f9ed6f165cf4e00b95fc44cc561e95449ebd5be76c95c14801c2ae2' 
  AND token = 'h1HfzX9ziY8J6OAiY5eg4uIUYxtHitppcYvNe3jiOus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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