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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7ae7d859ab8e0b3d9d939aad6afa2838b9f3d7ab77e0ba0791d784fcbecb34' 
  AND token = 'ogIH4s2/d99I6KH2B46cwYzqoElOYFsuPdINpUmwrzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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