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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfac303f614f7ce9c3c35e5772cae7a4de76f1aa2f104d5502d2ce6302349a5' 
  AND token = 'c56GA+TTfS7peCmV6PxsYBUwekJF4hK8YrNtsZtNoRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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