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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484c529520299a5215dc183d5323b5250905d20ad2e23296ddb930254b6ac4c5' 
  AND token = '56a/4108HjnWVWvF0wG//UjsHghh2ibvUQ4i3ZCTSf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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