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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c987ba49aa4b223b192eb84558f30fe8319a2ec339e206b29ce889b9d68f249' 
  AND token = 'OZW97hvkbmaeZDWXffXHH84dqH1aPtRpnynHb4I/1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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