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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576b3c79c4846f7a06fb31f692866d7e0eb877916dc8ce3829a3f63c2fa2b335' 
  AND token = 'Pda75RpebDyC53IUie/LkDySw77xwZ2tb3kPcQSWLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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