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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5889fdf8f86e109a32bbee57b062a90c6a55696b733592662c0bd23aa6897345' 
  AND token = 'KuBvrnQQMAJn9d3/EFrca7uOICMgpSjvcb7Zh9yuNjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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