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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc6589349887ef582e7cce630c5b8b2fb41348a720411e182e98b22427dc804' 
  AND token = 'blGmKVyvPViKQkQ5UwG9yfROoSmwFvxOKo85KCwpHv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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