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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0735ec396cf7698ec7efc797d80adc22b5655b2d39a7f954838d811717e1d567' 
  AND token = 'L2WF4gCG9mxMV4l0DkPPVxPrKsTBJo7R2EyeYevMeNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01209

JSON explain

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