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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f33bb4848bbd64fe29545ec0c03f66aecee4e36d0d4d383815399a01622c99' 
  AND token = 'KhAJ1bg6hk8za4ZbuUbWvOca48tBdfVy4e5ZhJvYWD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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