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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7c36690ba51249e3891d6fc894c8fbcf28a1faeb3a04e4b114b91c383a9690' 
  AND token = 'BJEZAPZ40z5twzREI/te+TaMHU9RE5h28hd0eoArMuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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