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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739317b9e6d603a31b9a676b3dacecd34b8a6e32c0341789412f797cbbe5948d' 
  AND token = '7LqvYcHdMcYs0b5OzDYhtpF5NwWpifm8+M6RwyFBrxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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