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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2badf5fe0402a841701b452c6c4a845f82e5cf4e817ab1aec81ff99534bfead' 
  AND token = 'XneGk+Zx5HH8KspGMA+tKEyVpkyj2FXttAb931Svc4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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