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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a651d4af09a34f856145d6c2e647f619fb11773e21771e72c42847b046e7c97' 
  AND token = 'wvjeYUSOV7oq0104OTfgmVFzgFSoXIndxl3N1Ev7Obc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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