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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820d5080cde70fbb70b3b67355b30fd1d7be36100bc08f83989ee6924c5c59bc' 
  AND token = 'rfbcObK0fHQCS2GPWafJjfF5vmSq3UUuTeZnH2wskkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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