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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca6e610b7c5e1c0d832e9b5235803fe0854fa9382a98e0472dadde8e8dc3104' 
  AND token = 'v1Ae4eWIjrcIpkVka6VHDSrTYek7gPhLyDmILILTlhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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