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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f3564a1ca13c4b823380c9e3d78cf4bc140eca6d9512a79d59ee41af7d4e61' 
  AND token = 'HRcmrRXN9iyxp/yLmoAtreEMpoJJfkWco5UWjd+FT+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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