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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15fc2fc0aa5b085556be0b1afc9cbe365a32991260c6253efe0f85fc794954b' 
  AND token = 'cUyA7GQSfb8c62e9Z75MxR6etCVyjo6bbh30b8AXizg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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