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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4761bb277e84b3c406bc3d2ea68f9c217293d3bf0ff330d01ea4b3ed0fc5af0' 
  AND token = 'xCsyO1pifGHpbJCt5m0p6A+9a9gI4t5IpDk7pRFaivY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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