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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd955cdcb84e7dea1f730a25d176b0726b35a8841d92a89575112ae5121b764e9' 
  AND token = '0C9uZrjZ4b/qaIpJrLV6YAzZUElbILyu4X0dFR4cDvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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