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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef670e24122a35e38db60aa4d54d6bef2f14072b31f561f6415a3c0a39c6d3f7' 
  AND token = 'YYTE0Kqhb3NYMQBQvThsHza6PKqSFsFwEUCNcemjE/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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