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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9b9df33333f9168eab2a7f6f63b4fce46fae94d6d08db38d636ecda9f58ca4' 
  AND token = 'ZTy2Wby/lUxLdutUMel7hIM8Je/m5mxEss1gtD/woGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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