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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8f26e5b91f72332d3b78d4aaefc6d12fdb3ee1f37eb3f0668a1384287aa4c0' 
  AND token = 'LCc5rcY5+cnh7pBHT/T5UdvgEkp2pqu2IkIWIcq3YR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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