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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6d3d805cf3b6d3ccf74c102daf8ed49aa627d5f88e8992dbb38c0325d4d9f8' 
  AND token = 'eg53lafdykEboFDckAeuN6uWWTeGEUDLqQctPgHrW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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