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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1f2cf4bbb786710c06140630c3f82861db87f1044c5831c19e0885f93e49bf' 
  AND token = 'M5L9qP5pqZX/dj9N0+X62Diov3Qe0kf8kDpCIpPx9e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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