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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7de8fa759224603315f7b5407648b7050d248bbc1b70c57164f06fff8ab7aa9' 
  AND token = 'vi0ehsS5KWhpLC0cggJRGY0Tr3Qlg6UJ8gIt4Wt2x8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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