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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b34d5d24de955ca9d8668a65f9baf52b6ab49c404e5a94177ec80852801ba49' 
  AND token = '9SUv4865u3Jk27PYlQimr9cL6FHKuQQ4dGDvRaYCMAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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