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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b9acd1ac8fc628ac570fb38f4ed0633f29b70892a35eecd8dd6a923db67f8b' 
  AND token = 'HlyAbkYXvt7LFA6mUltCzpFAlv1b0o1E4Bn7EMWemnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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