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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2cf15469db246bcdbecf5ef2d2e2da3af4031838dce0ea085d05f49c3a27fe' 
  AND token = 'hpIm6SBDlUSCQS8JDzHP1B10AG+1yWrvFdrw2KEfsfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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