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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f0b671bca5f6b11ec4b8c2716e48fc783b58fd2b4a389cd499c29b07ec030c' 
  AND token = 'wIRQ5gQyj5cYvPd9ei58QyLdUh2nn5RfDl/gDKU5azA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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