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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36dc766bb8427a708b958e6cd94ca6aed6337fb4ec97634358c3c43be51dd6f' 
  AND token = 'J7SP58GXg9i6SHfGkD/+4X7ald5IwfH+PLnlIXmJCzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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