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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb330e61572d94cb1baf5539e22e1da46c8d004b5f3d3fcc2391dab5f0036616' 
  AND token = '88VKQ3KHdNtKpYHT/h0CWUJWGGAkFoIi345/4L53Po0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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