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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2fc33caad2d00be1f90a5efd4f4aed843966892e0bb8bc3a48b3165b9f32ab' 
  AND token = 'VXS0mHHdWRH+KyViS6Ezv3jjvSRIq2iSA2y/NCdruP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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