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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3978753ab5fac74078b6d37731cd78df87f530ddf1bf66a530bb26a8e2771c' 
  AND token = 'dA5hQLqwwCPGvIgd2KW/ViH7BfuydRTf7lfpax8VhAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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