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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50c52e86ee8d99772ea97a0dc2ea24007ffefcfd336bb76c53107994e69cec3' 
  AND token = 'oM02buLmZkagC+PqIV84sWazifgH7ft1B524GZv9GuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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