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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668379cfa2450af438dd67c91d4edbbc09e6c36fdee9fedd0d9341a7f70dae6a' 
  AND token = 'WQkApqZYEHzNAdxnPuIugkuoyHsC6LaQV7uRA8FpP38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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