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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c9d1fbbc81262fe02dda5e6974d899b555d23418ba0adf67c2f17cf56c6ab7' 
  AND token = '1JsCbt2t7kFDPmoqb1/yTlxvV7L73kVI9RaEwYheqGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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