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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05bc78024c69b76763af47287c879d9e045137ac73f6fc997a7bca94ea4bcb3' 
  AND token = '6u1WmJxueeueGh5bBnrEbs5r7Glp9QSIy5PrH1o6IGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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