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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5a52dce5947a4fe8b04c5d9016ffa48b5b712857540f7f1d2c06780e56067c' 
  AND token = 'JFzUQLOXwY4T5ZEZR1L6Qzv3VXNCmUBbhmHekptsNr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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